#include <stdio.h>
int main() 
{
    int a, b, c;
    while (scanf("%d %d %d", &a, &b, &c) != EOF) 
    {
        if (a+b>c && a+c>b && b+c>a) 
        {
            if (a == b && b == c)
                printf("Equilateral triangle!\n");
            else if(a != b && b != c && a!=c )
                printf("Ordinary triangle!\n");
            else 
                printf("Isosceles triangle!\n");
        }
        else
            printf("Not a triangle!\n");
    }
    return 0;
}
